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Ca2+-sensitization mechanism in stretch-induced myogenic tone

Authors
 Jung Sup Kim  ;  Sung Kyung Ryu  ;  Duck Sun Ahn  ;  Bok Soon Kang  ;  Young Ho Lee 
Citation
 KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY, Vol.6(1) : 33-39, 2002 
Journal Title
 KOREAN JOURNAL OF PHYSIOLOGY & PHARMACOLOGY 
ISSN
 1226-4512 
Issue Date
2002
Keywords
Myogenic tone ; PKC ; RhoA ; Calcium ; Phosphorylation ; Basilar artery
Abstract
It has been suggested that Ca2+ sensitization mechanisms might contribute to myogenic tone, however, specific mechanisms have not yet been fully identified. Therefore, we investigated the role of protein kinase C (PKC)- or RhoA-induced Ca2+ sensitization in myogenic tone of the rabbit basilar vessel. Myogenic tone was developed by stretch of rabbit basilar artery. Fura-2 Ca2+ signals, contractile responses, PKC immunoblots, translocation of PKC and RhoA, and phosphorylation of myosin light chains were measured. Stretch of the resting vessel evoked a myogenic contraction and an increase in the intracellular Ca2+ concentration ([Ca2+]i) only in the presence of extracellular Ca2+. Stretch evoked greater contraction than high K+ at a given [Ca2+]i. The stretch-induced increase in [Ca2+]i and contractile force were inhibited by treatment of the tissue with nifedipine, a blocker of voltage-dependent Ca2+ channel, but not with gadolinium, a blocker of stretch-activated cation channels. The PKC inhibitors, H-7 and calphostin C, and a RhoA-activated protein kinase (ROK) inhibitor, Y-27632, inhibited the stretch-induced myogenic tone without changing [Ca2+]i. Immunoblotting using isoform-specific antibodies showed the presence of PKCalpha and PKCepsilon in the rabbit basilar artery. PKCalpha, but not PKCepsilon, and RhoA were translocated from the cytosol to the cell membrane by stretch. Phosphorylation of the myosin light chains was increased by stretch and the increased phosphorylation was blocked by treatment of the tissue with H-7 and Y-27632, respectively. Our results are consistent with important roles for PKC and RhoA in the generation of myogenic tone. Furthermore, enhanced phosphorylation of the myosin light chains by activation of PKCalpha and/or RhoA may be key mechanisms for the Ca2+ sensitization associated with myogenic tone in basilar vessels.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Physiology (생리학교실) > 1. Journal Papers
Yonsei Authors
Ahn, Duk Sun(안덕선) ORCID logo https://orcid.org/0000-0001-9351-6951
Lee, Young Ho(이영호) ORCID logo https://orcid.org/0000-0002-5749-1045
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/144476
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